Grinding and sharpening device.



J. F. FULLEN & F. W. COCHRANE.

GRINDING AND SHARPENING DEVICE.

APPLICATION FILED MAR. 1, 1915.

1 1 9'7 ,6 1 9 Patented Sept. 12, 1916.

4 SHEETS- -SHEET INVENTORS fiec/ W. Che/ram? Lid/m7 E Fame/7 I BY ,4 TTORN E Y J. F. FULLEN 6!. F. W. COCHRANE.

GRINDING AND SHARPENING DEVICE.

APPLICATION FILED MAR-1.1915.

Patented Sept. 12, 1916.

4 SHEETS-SHEET 2.

ATTORNEY J. F. FULLEN & F. W. COCHRANE.

GRINDING AND SHARPENING DEVICE.

APPLICATION FILED MAR. 1. 1915.

4 SHEETS-SHEET 3.

55 55 7 s g 5 3 1 26 1 53 i l 3:3 36

54 2 a Z 'l 32 Q 51 54 b\\ 3 W 4 L 1 WITNESSES: IN l E N TORS J. F; FULLEN & F. W. COCHRANE.

GRINDING AND SHARPENIN G DEVICE.

APPLICATIQM mu) MAR.1., ms.

1 1 97 61 9 Patented Sept. 12,1916.

4 SHEETS-SHEET 4.

WITNESSES: IN l/E/V TORS 2B. Q-me. d 7 Fred W COCIZHZHE' WM Julian RFuJJe 25 Arm/awn UNITED STATES PATENT OFFICE.

JULIAN F. FULLEN AND FRED W. COCHRANE, OF SEATTLE, WASITIN 'GTON.

GRINDING AND SHARPENING DEVICE.

Specification of Letters Patent.

Patented Sept. 12, 1916.

Application filed March 1, 1915. Serial No. 11,373

To all whom it may concern:

Be it known that we, J ULIANF. FULLEN,

and FRED WV. CooHRANE, citizens of the United States, and residents of the city of Seattle, county of King, and State of lVashington, (whose post-oitice address is 1063 Empire Building,) have invented certain new and useful Improvements in Grinding and Sharpening Devices, of which the fol lowing is a specification.

Our invention relates to improvements in grinding and sharpening devices and more particularly to improvements in devices for grinding and sharpening razor blades as safety razor blades and the like and the object of our improvement is to provide an extremely simple and reliable machine that is capable of sharpening such blades in a satisfactory manner and with great rapidity.

A further object of our improvement is to reduce the cost of construction of such machines by providing a large area of grinding and sharpening surfaces in proportion to the amount of grinding material used and the space occupied by such material and to provide means for efi'ecting a high peripheral speed of said grinding and sharpening surfaces with a minimum expenditure of power.

We accomplish these objects by devices illustrated in the accompanying drawings in which- Figure 1 is a plan view of a machine embodying our invention; Fig. 2, is a view in side elevation of the same, certain parts being shown in vertical section for the purpose of more clearly illustrating the same; Fig. 3, is a view in end elevation of the same; Fig. 4 is an enlarged fragmentary plan view in side elevation of a device for holding safety razor blades; Fig. 5 is a view in cross section on line A, A Fig. 4; Fig. 6, is a view in vertical cross section on broken line B, B, of Fig. 5, illustrating the blade holding device of Fig. 4, in its operative position in the carriage of the machine; Fig. 7 is a view in perspective of a detail of our invention; Fig. 8 is a view in side elevation of a modified form of blade holding device; Fig. 9, is a view in cross section on broken llne C, C, of Fig. 8, of the same; Fig. 10, is a view in perspective of a detail of a uide for facilitating the insertion of the b ade holding device into the carriage asembodied in our invention; Fig. 11, is a fragmentary view in side elevation of a modified form of grinding and sharpening machine and Fig. 12, is a view in cross section on broken line D, D, of Fig. 11.

Referring to the drawings throughout which like reference numerals indicate like parts, 1 is a base plate and 2 and 3 are two parallel spindles that are mounted for rotation in bearing brackets 4, 5, (3 and T and are disposed lengthwise of the base plate 1.

Rigidly secured to the spindles 2 and 3 at intervals throughout the greater portion of the length of such spindles are spaced grinding rings 8 of leather or other suitable sharpening material, such rings being so disposed that the rings on each spindle project slightly into the spaces between the rings on the opposite spindle, said spaces being slightly wider than the thickness of the rings as more clearly shown in Fig. 1.

The spindles 2 and 3 are provided with belt wheels or pulleys 9 and 10 respectively which are connected with a source of power as with a motor 11 by belts 12 and 13, one of the belts 13 being twisted in order-that the spindles2 and 3 may be rotated in opposite directions to cause the lower peripheries of the rings 8 to constantly approach each other when the spindles are rotated as shown by arrows in Fig. 3. v

The bearing brackets 4, 5, 6 and 7 are secured to the base plate 1 by set screws 14 which pass through slotted holes 1:") and such brackets are adapted for transverse adjustment on such base plate 1 by adjustment screws 16 that are held between lugs 17 and screw into the ends of said brackets .whereby the distancebetween the spindles 2 and 3 may be varied and such spindles may be adjusted to be parallel.

The ends 18, of the spindles 2 and 3 are of a reduced diameter as shown in Fig. 2, and are journaled in bearings 19 that are disposed within sleeves 20 that fit within cylindrically shaped openings in the brackets 4, 5, 6 and 7 the bearings 19, as more clearly shown in Fig. 7, having a large external central diameter and tapering toward both ends whereby they are free to adjust themselves to be inline with the center of rotation of their respective spindles 2 or 3 when the,opposite end of such spindle is moved.

by its adjustment screw 16, such bearings each being provided near its front end with a slot 21 within which a ring oiling device of a well known type is adapted to operate.

To prevent the bearings 19 from rotating within the sleeve 20 we have provided a screw 23 that is disposed to screw downwardly thrbugh the bearing brackets 4, 5, 6 or 7 and the ring 20 and to have its rounded end fit within a groove 2-1 that is Provided in the bearing 19.

In Figs. 4, 5 and 6 wherein we have illustrated a blade holding device and a carriage for such blade holding device, 25 is a fiat. steel plate that is provided on its inside surface with a longitudinally extending slot 26, and 27 is another flat steel plate that is adapted to be placed beside the plate 25 to form a blade clamping device, as more clearly shown in Fig. 6, the plate 27 being so formed that it is adapted to bear against the plate 25 at its top and bottom edges only. The plate 25 is provided at regular intervals with stud bolts or rivets 28 that project from the inside surface thereof and are adapted to extend outwardly through suitably spaced holes 29 in the plate 27 and thencethrough keyhole shaped slots 31 in a clamping spring 32 which spring 32 is slidablv secured to the plate 27 by screws 33 that pass through slots 34 and adapt such spring to be moved lengthwise of the plate 27, the heads of the stud rivets 28 being adapted readily to pass through \the enlarged portions of the keyhole shaped slots 31 thus permitting the plate 27 to be quickly disengaged from the plate 25 when blades 35 are to be placed in the. blade holding device or removed therefrom. A stud 36 is provided in the spring 32 and a similar stud 37 is provided in the plate 27 such studs being adapted to have a wrench 38, illustrated by broken lines in Fig. 4, placed thereon for the purpose of moving the spring 32 lengthwise of the plate 27 to clamp and release the blades 35. A longitudinal groove 39 is provided in one side of the plate 25 near its bottom edge which groove adapts the plate 25 to fit within and be held by a suitable trackwav provided in a carriage 40, which carriage is provided with a. suitable top plate 41 and bottom plate 42 and with side rollers 43 and is adapted to be reciprocated longitudinally on a rectangularly shaped bar 44 that is secured to the base plate 1, the reciprocation of such carriagebeing accomplished by a reciprocating bar 45 that is articulated at one end with a shank 46, that is rigidly secured to the carriage 40, and at the other end with a crank arm 47 that is secured to the bottom end of a vertical shaft 48 upon whose top end is mounted a worm gear wheel 49 that meshes with a worm gear 50 on the spindle 2. the shaft 48 being journaled in a suitable bearing bracket 51 that is secured to the bracket 4. A stud 52 is provided in the plate 25 near its outer end and a spring pressed pawl 53 is articulated with the carriage 40 and is adapted to engage with the stud 52 to prevent the blade clamping device from moving outwardly in the carriage 40 when the machine is in use the outer end of the pawl 53 projecting to a point where it is accessible to the operator in order that it may quickly and easily be released from engagement with the stud 52 when the blade holding device is to be removed from carriage 40.. The plate 27 terminates in a handle 54, and a guide 55" more clearly illustrated in Fig. 10, is secured to the end ofuthe base plate 1 to facilitate the insertion of the blade holding device into the carriage 40.

In Figs. 8 and 9 wherein we have shown a form of holder adapted to clamp an ordinary straight razor blade, 85 is a plate that is provided'near its bottom edge with a groove 56 similar to the groove 39 to adapt it to fit within the carriage 40, and

57 is a side plate to which are secured springs 58 each of which springs is provided witha keyhole shaped slot 59 through which a stud screw 60 that is provided in the plate 85 is adapted to fit to clamp a blade 61 in an obvious manner. If a grinding operation is desired and the collars 8 are constructed of suitable abrasive'material, a single passage of the blade along said collars may be effected by the alternative construction illustrated in Figs. 11 and 12 wherein the blade holder 62 is provided with lateral projections 63 dovetailing with the grooves 64 in the frame 65. A downward projection 66 on said holder engages with projections 67 on a chain or other endless member 68 driven by a sprocket 69 rigidly attached to ashaft 70. The shaft 70 is carried in bearin 71 in the frame 65 and is rotated by a arge friction wheel 72 which is rigidly secured thereto and is driven by a small friction wheel 73 that is secured to a shaft 74 which is driven by a worm wheel 75 and worm gear 76 in a manner hereinbefore described. The holders 62 in this type of machine are adapted to enter at one end and pass out at the other end of such machine, thus a continuous stream of holders may be passed through such a machine.

When blades are to be sharpened in our vblades 38 lightly engaging with the abrasive rings 8 in such manner that the blades are ground until they are sharp such blades being firmly held by the clamping device to prevent them from being drawn upwardly between the grinding disks 8.

Obviously many changes in the mechanical construction of our machine may be made without departing from the spirit of our invention or sacrificing any of its advantages, viz: parallel spindles each respectively provided witha strip of abrasive material helically attached thereto in place of the collars as above described.

Having thus indicated the ends sought by us what we claim as new and desire to protect by Letters Patent, is:

1. A rinding and sharpening machine, the com ination of rotating parallel spindles, carrying collars of sharpenin and grinding material, said spindles being so disposed as to adapt said collars on each of said spindles to slightly enter grooves between the collars on another of said spindles, a longitudinally reciprocating carriage, a

holder adapted to clamp a blade, said holder being adapted to be inserted in said carriage, and means for automatically retaining said holder therein.

2. In a grinding and sharpening machine, the combination of oppositely rotating parallel spindles, carrying collars of sharpening or grinding material, said spindles being so disposed as to adapt said collars on each one of said spindles to slightly enter grooves between the collars on others of said spindles, means for adjusting, the distance between said spindles, a longitudinally reciprocating carria e, a holder adapted to clamp a blade, said holder being adapted to be inserted in said carriage, and means for automatically retaining said holder therein.

JULIAN F. FULLEN. FRED W. COCHRANE. Witnesses:

J. T. FITCH, ERNEST B. HERALD. 

